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I tore down and rebuilt my 48RE AND installed it back in my truck and it’s like the truck is always in neutral there’s no gears!!! Any help will be greatly appreciated.
 

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NO DRIVE OR REVERSE
(VEHICLE WILL NOT MOVE)
1. Fluid Level Low.
1. Add fluid and check for leaks if drive is restored.

2. Gearshift Linkage/Cable Loose/ Misadjusted.
2. Inspect, adjust and reassemble linkage as needed. Replace worn/damaged parts.

3. U-Joint/Axle/Transfer Case Broken.
3. Perform preliminary inspection procedure for vehicle that will not move. Refer to procedure in diagnosis section.

4. Filter Plugged.
4. Remove and disassemble transmission. Repair or replace failed components as needed. Replace filter. If filter and fluid contained clutch material or metal particles, an overhaul may be necessary. Perform lube flow test. Flush oil. Replace cooler as necessary.

5. Oil Pump Damaged.
5. Perform pressure test to confirm low pressure. Replace pump body assembly if necessary.

6. Valve Body Malfunctioned.
6. Check and inspect valve body. Replace valve body (as assembly) if any valve or bore is damaged. Clean and reassemble correctly if all parts are in good condition.

7. Transmission Internal Component Damaged.
7. Remove and disassemble transmission. Repair or replace failed components as needed.

8. Park Sprag not Releasing - Check Stall Speed, Worn/Damaged/Stuck.
8. Remove, disassemble, repair.

9. Torque Converter Damage.
9. Inspect and replace as required.
 

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Did you get this fixed? #3 above has always been an issue for me. U-joints have never lasted long on my truck
 

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I tore down and rebuilt my 48RE AND installed it back in my truck and it’s like the truck is always in neutral there’s no gears!!! Any help will be greatly appreciated.
This could literally be any one of a hundred or more things. You'll have to retrace your steps and find the problem(s).
 
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